UNOAIR I-47 ( " ) Impact Wrench ( Twin Hammer) Torque : 400 Ft-Lb Specification Model : I-47 Square Drive in : Bold Size Capacity in : u ? mm : 16 Free Speed rpm : 7000 Max Torque ft-lb : 400 n-m : 542 Overall Length in : 7-11 16 mm : 195 Net Weight lbs : 5.73 kgs : 2.6 Air Inlet ( in) : Air Hose ( in) : Avg.Air Consumption cfm : 6 m / min : 0.17